In the UK, the Infanticide Act defines infanticide as a specific crime that can only be committed by the mother during the first twelve months of her baby's life. This article deals with the broader notion of infanticide explained above.

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The practice of infanticide has taken many forms. Child sacrifice to supernatural figures or forces, such as that allegedly practiced in ancient Carthage, is one form; however, many societies only practiced simple infanticide and regarded child sacrifice as morally repugnant. Critics have argued that child sacrifice was simply infanticide disguised and both driven by the same socio-economic considerations.[1]

Judaism prohibits infanticide; Josephus wrote, "The Law orders all the offspring to be brought up, and forbids women either to cause abortion or to make away with the fetus." The ancient Germanic tribes enforced a similar prohibition. Roman historian Tacitus found such mores remarkable and commented on both in nearly identical language: .. .quemquam ex agnatis necare flagitium habetur.. ., "[The Germani] hold it shameful to kill any unwanted child" (Germania),[2] and ...nam et necare quemquam ex agnatis nefas... putant, "[The Jews] think it criminal to kill any unwanted child" (Histories)[3]).

A letter from a Roman citizen to his wife, dating from 1 BC, demonstrates the casual nature with which infanticide was often viewed:

"Know that I am still in Alexandria. [...] I ask and beg you to take good care of our baby son, and as soon as I received payment I shall send it up to you. If you are delivered [before I come home], if it is a boy, keep it, if a girl, discard it." – Naphtali Lewis, Life in Egypt Under Roman Rule.[4].

In some periods of Roman history it was traditional in practice for a newborn to be brought to the pater familias, the family patriarch, who would then decide whether the child was to be kept and raised, or left to death by exposure. The Twelve Tables of Roman law obliged him to put to death a child that was visibly deformed. Although infanticide became a capital offense in Roman law in AD 374, offenders were rarely if ever prosecuted. A practice described in Roman texts was to smear the breast with opium residue so that a nursing baby would die with no outward cause.[How to reference and link to summary or text]

Christianity rejected infanticide. The Didache said "You shall not murder a child by abortion nor kill that which is born." So widely accepted was this teaching that Justin Martyr defended not abandoning children, "lest some of them be not picked up, but die, and we become murderers":

"But as for us, we have been taught that to expose newly-born children is the part of wicked men; and this we have been taught lest we should do any one an injury, and lest we should sin against God, first, because we see that almost all so exposed (not only the girls, but also the males) are brought up to prostitution."[5]

There is little evidence that infanticide was prevalent in pre-Islamic society or medieval Arabia, except for the case of the Tamim tribe who practiced it during severe famine.[6] Infantcide is explicitly prohibited by the Qur'an.[7]

Many historians believe the reason to be primarily economic, with more children born than the family is prepared to support. In societies that are patrilineal and patrilocal, the family may choose to allow more sons to live and kill some daughters, as the former will support their birth family until they die, whereas the latter will leave economically and geographically to join their husband's family, possibly only after the payment of a burdensome dowry price. Thus the decision to bring up a boy is more economically rewarding to the parents.[How to reference and link to summary or text] However, this does not explain why infanticide would occur equally among rich and poor, nor why it would be as frequent during decadent periods of the Roman Empire as during earlier, more affluent, periods.[How to reference and link to summary or text] In times of famine or cases of extreme poverty or other desperate circumstances, parents may have to choose which of their children will live and which will die. (See Sophie's Choice.)

In 1888, Elton reported that beach people on the island of Ugi in the Solomon Islands kill their infants at birth by burying them, and women were also said to practice abortion. They reported that it was too much trouble to raise a child, and instead preferred to buy one from the bush people.[11]

Other anthropologists have suggested a variety of largely culture-specific reasons for infanticide. In cultures where different value is placed on male and female children, sex-selective infanticide may be practiced simply to increase the proportion of children of the preferred sex, usually male. (This is linked to the economic reasons above.) In cultures where childbearing is strongly tied to social structures, infants born outside of those structures (illegitimate children, children of incest, children of cross-caste relationships, and so forth) may be killed by family members to conceal or atone for the violation of taboo.

In addition to debates over the morality of infanticide itself, there is some debate over the effects of infanticide on surviving children, and the effects of childrearing in societies that also sanction infanticide. Some argue that the practice of infanticide in any widespread form causes enormous psychological damage in children.[How to reference and link to summary or text] Some anthropologists studying societies that practice infanticide, however, have reported how loving the parents were to their children.[How to reference and link to summary or text] (Harris and Divale's work on the relationship between female infanticide and warfare suggests that there are, however, extensive negative effects).

The idea of there being "100 million missing women", largely in Asia, originated with or was popularised by an influential 1990 essay by Amartya Sen. [12] This gender gap may indeed be partly explained by female infanticide and sex-selective abortion. However, recent statistical evidence gathered by Emily Oster suggests that outbreaks of hepatitis B, which causes female fetuses to miscarry at a higher rate than male fetuses, may account for a large proportion, perhaps up to half, of the "missing" women.[13].

In the Netherlands, euthanasia remains technically illegal for patients under the age of 12. However, Dr. Eduard Verhagen has documented several cases of infant euthanasia. Together with colleagues and prosecutors, he has developed a protocol to be followed in those cases. Prosecutors will refrain from pressing charges if this Groningen protocol is followed.[14][15]

The Royal College of Obstetricians and Gynaecology (RCOG) has recently recommended to "Allow Active Euthanasia for Disabled Babies, Doctors Urge"[16]
that physicians should be allowed to make “deliberate interventions to kill infants” who are disabled. It has been argued that killing disabled babies will save millions of pounds that otherwise would be required to care for them.

There have been some accusations that infanticide occurs in the People's Republic of China due to the one-child policy although most demographers do not believe that the practice is widespread. In the 1990s, a certain stretch of the Yangtze River was known to be a common site of infanticide by drowning, until government projects made access to it more difficult. Others assert that China has twenty-five million fewer girl children than expected, but sex selective abortion can partially be to blame. The illegal use of ultrasound is widespread in China, and itinerant sonographers with plain vans in parking lots offer inexpensive sonographs to determine the sex of a fetus.

Infanticide based on sexual competition has the general theme of the killer (often male) becoming the new sexual partner of the victim's parent which would otherwise be unavailable to it. This represents a gain in fitness by the killer, and a loss in fitness by the parent of the offspring killed. This is a form of sexual conflict and is a type of evolutionary struggle between the two sexes, in which the victim sex may have its own counter-adaptations which reduce the success of this practice. It may also occur due to non-sexual competition, such as the struggle for food between females. In this case individuals may even kill closely related offspring.

Filial infanticide occurs when a parent kills its own offspring. This often involves consumption of the young themselves, which is termed filial cannibalism. The behavior is widespread in fishes, and is seen in many terrestrial animals as well, including pigs, where it can be costly to farmers. Unlike humans, most other animals are not seen to practice sex-selective infanticide.

↑ 5.05.1"But as for us, we have been taught that to expose newly-born children is the part of wicked men; and this we have been taught lest we should do any one an injury, and lest we should sin against God, first, because we see that almost all so exposed (not only the girls, but also the males) are brought up to prostitution." "lest some of them be not picked up, but die, and we become murderers" First Apology, Justin Martyr

↑http://www.slate.com/id/2119402/ "The Search for 100 Million Missing Women: An economics detective story." A Slate article by Stephen J. Dubner and Steven D. Levitt, reporting the work of Emily Oster, "Hepatitis B and the Case of the Missing Women", Journal of Political Economy, 113(6): p. 1163-1216 (December 2005)